【Q&A Question 071】March 12, 2018
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【Q&A Question 071】March 12, 2018: What are the causes of pressure fluctuations in a distillation tower? 1. Fluctuations in feed or tower top reflux flow ； 2. Water and composition variations in the feed or tower top reflux ； 3. Changes in the gas backpressure in the reflux tank, blockage in the downstream path, or pressure changes ； 4. Change in temperature after cooling ； 5. Changes in the temperature of the fluid returning to the tower, etc. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Due to the limitations on the number of posts in the “One Question per Day” section, “One Image per Day” has been moved to the registered devices section; you can access it through the directory I posted. For management purposes, if you need to access content from a few days ago, please go to the summary post below to enter the “My Registration Season” event – (Note: This event is currently underway in the Chemical Engineering section) https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=18978. Summary post of daily questions for the 2018 Chemical Engineering Technology Training section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888971. Summary post of daily images for the 2018 Registered Equipment section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888970. Summary post of Q&A questions for the 2018 Hydrogen Production and Hydrogenation Technology section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888968. Summary post of daily questions for the 2018 LNG Technology Discussion section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888973. Summary post of Q&A questions for 2017 (updates have started): https://bbs.hcbbs.com/thread-1657793-1-1.html. Summary post of daily questions for 2017 (updates have started): https://bbs.hcbbs.com/thread-1657794-1-1.html. Summary post of daily images for 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160. List of daily questions for the 2017 LNG section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162. Summary post of Q&A questions for 2016 (updates completed): https://bbs.hcbbs.com/thread-1597792-1-1.html
Water and light components in the feed stream, fluctuations in reflux flow, fluctuations in stripping steam, fluctuations in feed volume, and temperature fluctuations
Water and light components in the feed stream, fluctuations in reflux flow, fluctuations in stripping steam, fluctuations in feed volume, and temperature fluctuations
(1) Fluctuations in feed or tower top reflux flow； (2) Changes in water content and composition in the feed or tower top reflux ； (3) Changes in the back pressure of the gas (non-condensable gas) in the reflux tank, blockage in the downstream path, or pressure changes ； (4) Change in temperature after cooling ； (5) Changes in the temperature of the fluid returning to the tower, etc
(1) Fluctuations in feed or tower top reflux flow； (2) Changes in water content and composition in the feed or tower top reflux ； (3) Changes in the back pressure of the gas (non-condensable gas) in the reflux tank, blockage in the downstream path, or pressure changes ； (4) Change in temperature after cooling ； (5) Changes in the temperature of the fluid returning to the tower, etc.
Answer: 1. Fluctuations in feed or tower top reflux flow； 2. Water and composition variations in the feed or tower top reflux ； 3. Changes in the gas backpressure in the reflux tank, blockage in the downstream path, or pressure changes ； 4. Change in temperature after cooling ； 5. Changes in the temperature of the fluid returning to the tower, etc.
1. Fluctuations in feed or tower top reflux flow； 2. Water and composition variations in the feed or tower top reflux ； 3. Changes in the gas backpressure in the reflux tank, blockage in the downstream path, or pressure changes ； 4. Change in temperature after cooling ； 5. Changes in the temperature of the fluid returning to the tower, etc.
1. Changes in feed temperature. 2. Changes in feed composition. 3. The return flow is unstable. 4. Changes in reflux temperature.
Water and light components in the feed stream, fluctuations in reflux flow, fluctuations in stripping steam, fluctuations in feed volume, and temperature fluctuations
(1) Fluctuations in feed or tower top reflux flow； (2) Changes in water content and composition in the feed or tower top reflux ； (3) Changes in the back pressure of gas in the reflux tank, blockages in the pipelines downstream, or pressure changes. (4) Change in cooling temperature. (5) Change in temperature of reflux to the tower.
Tower surging, water carried back in the reflux stream, large variations in reflux temperature, low temperature at the tower bottom, low feed temperature